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We have to find the total of all cars (including X) in order to find the fraction that contributes to X.
Total = X + 11A ..... (we can use 11A here in place of total cost of all cars besides X)
= 2A + 11A
= 13A

Now, we have to find the fraction of the total cost that is contributed to X.
Fraction = X / Total
= 2A / 13A
= 2/13 ..... (A's cancel out)